On the OP rx. In my Personal Opinion. From everything I have ever read, heard, or seen. My Pesonal and Truthful answer and THIS IS ONLY MY OPINION WHICH IS NOT BASED ON 100% CERTAINTY, BUT ON WHAT SEEMS TRUE AND PROBABLE TO ONLY ME. I am not a lawyer nor have I read every US state and federal law.

My opinion is: Why in the world would I tell my employer or anybody for that matter, that if they gave me a drug test, if I then failed the test and presuming the doctor calls me and says he needs to see a valid rx. Why would I tell him that the rx was from a pharmacy I found online or from a place that I send records into???? And not from a brick and mortar office, then take that script to walgreens to fill???

If I have a rx bottle with my name on it and the pharmacies name and number on that same bottle why is the RX UPS gave me any different from the one at wallgreens, that is also delivered by UPS??

When u get a script filled at the grocery store, do you tell your boss or any one else it's a "Prescription from Johnny's Pharmacy, because I went to the Dr. at 1234 South Las Vegas Blvd. Las Vegas, NV 89129 and the Dr thought it was resonable and prudent to use this medication for my current medical condition." I'm guessing probaly not.

If asked by someone if I have a rx for this or that. I tell them yes I do. If I do indeed have one. Or no if I don't have one. I don't say : "Yes I have a rx but I'm not sure if it's legal or not. So would you please contact a lawyer or judge to find out if it's in fact legal or if it's more of a grey area, and if it's a grey area would you like to just fire me, because you don't approve of the way I manage my health by talking to a doctor on the phone that has seen my medical records and also has the same education and credentals as the doctor across the street."

When I go to my local Dr, I have never asked about thier education or training. And I'm sure most people don't.
How do you know that the doctor you just called in the yellow pages is an acctual doctor, and not someone who paid the phone company money to advertise in thier yellow pages.
I know that in my state if your a contracter and you advertise in the newspaper you have to include your buisness license #. But does the newspaper verify they do indeed have a #, and that it's not a made up one? And also how easy is it to get a buisness license? Do you need expereince in the that field? Or can you just start the company up and say you are going to have people that are trained in that field work at your company?

All I'm saying is that if you have a bottle w/your name, the parmacy name & # on that bottle. Why would that be an issue.
You spoke w/the dr. or dr's asst. and they decided to write you a script for your condition. Why is this a problem? Is thier any laws forbiding people to get a presription in a city they don't live in? Or a law that says if you live at XY and get a rx at YZ, then come back to XY, you can only use that rx when you are in YZ.
If your getting a new job, or live in a state that has an "at will employment" policy. I wouldn't take any prescription at all. Because if you fail or pass the drug test they can decide to not hire you, or fire you. They may think that since your on medication for back pain. That you are more likely to get re-injuried. And they are not going to hire someone thats more likely to get injured then someone who doesn't have a bad back.
Having back problems is one of the biggest claims for workers comp. If more employees get injured the company is going to pay more money, bottom line. Companies do not want to hire someone with a bad back if they don't have to. Or a drug addict.